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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '518298e953f7b95ce87831d3519d4a110b4d0567ebc55375c92c767fcc5720e5' 
  AND token = 'R5USfLeEFn0/1+iKfczVWikgd/nv/4fj/qg8ZHem16o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}